package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.SetmealDTO;
import com.sky.dto.SetmealPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.SetmealDish;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.exception.SetmealEnableFailedException;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.SetmealService;
import com.sky.vo.DishItemVO;
import com.sky.vo.SetmealVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;


    /**
     * 套餐业务实现
     */
    @Service
    @Slf4j
    public class SetmealServiceImpl implements SetmealService {

        @Autowired
        private SetmealMapper setmealMapper;
        @Autowired
        private SetmealDishMapper setmealDishMapper;
        @Autowired
        private DishMapper dishMapper;



        /**
         * 新增套餐，同时需要保存套餐和菜品的关联关系
         * @param setmealDTO
         */
        @Transactional
        public void saveWithDish(SetmealDTO setmealDTO) {
            Setmeal setmeal = new Setmeal();
            BeanUtils.copyProperties(setmealDTO, setmeal);

            //向套餐表插入数据
            setmealMapper.insert(setmeal);

            //获取生成的套餐id
            Long setmealId = setmeal.getId();

            List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
            setmealDishes.forEach(setmealDish -> {
                setmealDish.setSetmealId(setmealId);
            });

            //保存套餐和菜品的关联关系
            setmealDishMapper.insertBatch(setmealDishes);
        }
        /**
         * 分页查询
         * @param setmealPageQueryDTO
         * @return
         */
        public PageResult pageQuery(SetmealPageQueryDTO setmealPageQueryDTO) {
            int pageNum = setmealPageQueryDTO.getPage();
            int pageSize = setmealPageQueryDTO.getPageSize();

            PageHelper.startPage(pageNum, pageSize);
            Page<SetmealVO> page = setmealMapper.pageQuery(setmealPageQueryDTO);
            return new PageResult(page.getTotal(), page.getResult());
        }
        /**
         * 批量删除套餐
         * @param ids
         */
        @Transactional
        public void deleteBatch(List<Long> ids) {
            ids.forEach(id -> {
                Setmeal setmeal = setmealMapper.getById(id);
                if(StatusConstant.ENABLE == setmeal.getStatus()){
                    //起售中的套餐不能删除
                    throw new DeletionNotAllowedException(MessageConstant.SETMEAL_ON_SALE);
                }
            });

            ids.forEach(setmealId -> {
                //删除套餐表中的数据
                setmealMapper.deleteById(setmealId);
                //删除套餐菜品关系表中的数据
                setmealDishMapper.deleteBySetmealId(setmealId);
            });
        }
        /**
         * 根据id查询套餐和套餐菜品关系
         *
         * @param id
         * @return
         */
        public SetmealVO getByIdWithDish(Long id) {
            Setmeal setmeal = setmealMapper.getById(id);
            List<SetmealDish> setmealDishes = setmealDishMapper.getBySetmealId(id);

            SetmealVO setmealVO = new SetmealVO();
            BeanUtils.copyProperties(setmeal, setmealVO);
            setmealVO.setSetmealDishes(setmealDishes);

            return setmealVO;
        }

        /**
         * 修改套餐
         *
         * @param setmealDTO
         */
        @Transactional
        public void update(SetmealDTO setmealDTO) {
            Setmeal setmeal = new Setmeal();
            BeanUtils.copyProperties(setmealDTO, setmeal);

            //1、修改套餐表，执行update
            setmealMapper.update(setmeal);

            //套餐id
            Long setmealId = setmealDTO.getId();

            //2、删除套餐和菜品的关联关系，操作setmeal_dish表，执行delete
            setmealDishMapper.deleteBySetmealId(setmealId);

            List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
            setmealDishes.forEach(setmealDish -> {
                setmealDish.setSetmealId(setmealId);
            });
            //3、重新插入套餐和菜品的关联关系，操作setmeal_dish表，执行insert
            setmealDishMapper.insertBatch(setmealDishes);
        }
        /**
         * 套餐起售、停售
         * @param status
         * @param id
         */
        public void startOrStop(Integer status, Long id) {
            //起售套餐时，判断套餐内是否有停售菜品，有停售菜品提示"套餐内包含未启售菜品，无法启售"
            if(status == StatusConstant.ENABLE){
                //select a.* from dish a left join setmeal_dish b on a.id = b.dish_id where b.setmeal_id = ?
                List<Dish> dishList = dishMapper.getBySetmealId(id);
                if(dishList != null && dishList.size() > 0){
                    dishList.forEach(dish -> {
                        if(StatusConstant.DISABLE == dish.getStatus()){
                            throw new SetmealEnableFailedException(MessageConstant.SETMEAL_ENABLE_FAILED);
                        }
                    });
                }
            }
            Setmeal setmeal = Setmeal.builder()
                    .id(id)
                    .status(status)
                    .build();
            setmealMapper.update(setmeal);
        }

        /**
         * 条件查询
         * @param setmeal
         * @return
         */
        public List<Setmeal> list(Setmeal setmeal) {
            List<Setmeal> list = setmealMapper.list(setmeal);
            return list;
        }
        /**
         * 根据id查询菜品选项
         * @param id
         * @return
         */
        public List<DishItemVO> getDishItemById(Long id) {
            return setmealMapper.getDishItemBySetmealId(id);
        }
    }


